Senior Full Stack Engineer - FX e Trading - London Atrium EMEA is looking for several Senior Full Stack Engineer with good experience of FX e Trading (React/TypeScript + Java) to help architect and build a new FX e trading platform from the ground up, working across the stack to deliver high performance, resilient, and secure systems. You will partner closely with product, trading, and infrastructure teams to deliver features end to end-from UI and desktop container experiences to low latency Back End services. Lean into the latest AI coding tools to accelerate delivery, strengthen code quality, and enhance developer experience. 4 days onsite in London. PAYE/Umbrella options. * Lead design and development of full stack features: React/TypeScript web apps, desktop container integrations (OpenFin or similar), and Java services.* Architect and implement scalable, event driven, and microservices based Back End components (eg, Spring Boot), including APIs, market data, order/risk workflows, and Real Time streaming.* Build performant and accessible UIs with modular, reusable components; drive state management, data visualization, and UX for trading workflows.* Optimize latency, throughput, and reliability across the stack; instrument observability (metrics, tracing, logging) and performance profiling.* Establish engineering best practices: code standards, testing strategies (unit/integration/E2E), CI/CD, secure coding, and release management.* Mentor engineers through code reviews,